Ir-Ce基氧化物涂层阳极电容性能研究
发布时间：2019-04-24 05:55
【摘要】：电极材料是决定电容性能的重要因素。贵金属氧化物IrO2通过自身的氧化还原反应来实现能量的存储,理论上有着很高的赝电容,同时又具金属导电特性和优异的耐酸碱腐蚀性,是优秀的电容储能材料。目前对IrO2作为电容器电极材料的报道相对较少。添加CeO2可有效提高氧化钌电容性能,但是未见有关CeO2对IrO2基氧化物电容性能影响的研究报导。本文采用热分解法制备了铱铈二元和铱锡铈三元电极材料。采用XRD、SEM测试手段表征了电极材料的相结构及微观形貌,并采用循环伏安和恒流充放电、交流阻抗等方法对其电化学性能进行了详细研究。结果如下：(1)制备温度对Ti/Ir0.7Ce0.3O2电极结构和电容性能有显著影响。随制备温度升高，，Ir0.7Ce0.3O2涂层由非晶态向晶态转变,晶化程度逐渐升高,电极比电容则呈现先增大后减小变化。当制备温度为380℃时,Ti/Ir0.7Ce0.3O2电极的电容达到最大值。经过8000次循环充放电测试后,比电容增加6.8%,说明该电极拥有优异的循环充放电稳定性。(2)成分对Ti/IrO2-CeO2电极的结构与电容性能亦有显著影响。随CeO2含量增加,IrO2晶化程度逐渐降低,说明CeO2有抑制IrO2结晶的作用。添加60mo1%CeO2可获得最高比电容,但功率特性较差。添加40% CeO2也能明显提高Ti/IrO2-CeO2电极的比电容,此时功率特性明显得到改善。CeO2含量升高会导致电极涂层导电性能下降,当CeO2添加量达到80%时,整个电极相当于一个电阻。(3)CeO2替代Tr0.3Sn0.7O2中部分SnO2可有效提高电极电容性能。随CeO2含量增加,IrO2-SnO2晶化程度逐渐下降,当CeO2含量超过30mol%时,IrO2-SnO2为非晶结构。含10mol%CeO2电极的比电容为392.3 F/g,20mol%CeO2电极的比电容可达505.7F/g,均高于Ti/Ir0.3Sn0.7O2电极,后者提高约2倍。CeO2在0～20mol之间,电极具有较好的功率特性。继续添加CeO2,功率特性衰减严重,与电极导电性下降有关。(4)Ti/Ir0.3Sn0.5Ce0.2O2电极在340和380℃可获得较高比电容。尝试采用交流阻抗方法对电极电容性能进行表征,比电容分别522 F/g,490 F/g,高于循环伏安方法计算得到的电容,因为交流阻抗可减少溶液电阻对电容的影响。同时对交流阻抗数据进行拟合,得到电极的内外活性比例,为电极内外活性面积的分析提供了新方法。
[Abstract]:The electrode material is an important factor to determine the performance of the capacitor. The noble metal oxide IrO2 can realize the storage of energy by the self-oxidation reduction reaction, has a high pseudo-capacitance in theory, and also has the characteristics of metal conduction and excellent acid and alkali resistance, and is an excellent capacitive energy storage material. The current coverage of IrO2 as a capacitor electrode material is relatively small. The addition of CeO2 can effectively improve the performance of the oxidation and capacitance, but no research has been found on the effect of CeO2 on the capacitance performance of the IrO2-based oxide. In this paper, the three-way electrode materials of the binary and the tribdenum disulfide are prepared by the thermal decomposition method. The phase structure and micro-morphology of the electrode material were characterized by XRD and SEM. The electrochemical performance of the electrode material was studied by cyclic voltammetry and constant current charging and discharging, and AC impedance. The results are as follows: (1) The preparation temperature has a significant effect on the structure and the capacitance of the Ti/ Ir0.7Ce0. 3O2 electrode. As the preparation temperature is increased, Ir0.7Ce0. 3O2 coating is changed from the amorphous state to the crystalline state, the degree of crystallization is gradually increased, and the ratio of the electrode to the capacitance is firstly increased and then the change is reduced. The capacitance of Ti/ Ir0.7Ce0. 3O2 electrode reached the maximum when the preparation temperature was 380 鈩
本文编号：2464160
[Abstract]:The electrode material is an important factor to determine the performance of the capacitor. The noble metal oxide IrO2 can realize the storage of energy by the self-oxidation reduction reaction, has a high pseudo-capacitance in theory, and also has the characteristics of metal conduction and excellent acid and alkali resistance, and is an excellent capacitive energy storage material. The current coverage of IrO2 as a capacitor electrode material is relatively small. The addition of CeO2 can effectively improve the performance of the oxidation and capacitance, but no research has been found on the effect of CeO2 on the capacitance performance of the IrO2-based oxide. In this paper, the three-way electrode materials of the binary and the tribdenum disulfide are prepared by the thermal decomposition method. The phase structure and micro-morphology of the electrode material were characterized by XRD and SEM. The electrochemical performance of the electrode material was studied by cyclic voltammetry and constant current charging and discharging, and AC impedance. The results are as follows: (1) The preparation temperature has a significant effect on the structure and the capacitance of the Ti/ Ir0.7Ce0. 3O2 electrode. As the preparation temperature is increased, Ir0.7Ce0. 3O2 coating is changed from the amorphous state to the crystalline state, the degree of crystallization is gradually increased, and the ratio of the electrode to the capacitance is firstly increased and then the change is reduced. The capacitance of Ti/ Ir0.7Ce0. 3O2 electrode reached the maximum when the preparation temperature was 380 鈩
本文编号：2464160
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